Public Health Nurses Hunt Cyclospora Source Through Patient Food Histories

Washtenaw County nurses, pulled from other duties, are calling hundreds of cyclosporiasis patients to reconstruct everything they ate.

Hundreds of people in Washtenaw County, Michigan have fallen ill with cyclosporiasis, a parasitic intestinal illness, prompting a hands-on public health investigation to identify the food source. Public health nurses have been reassigned from their regular duties specifically to conduct the outbreak interviews, reflecting the scale of the response needed. The nurses are calling each sick person individually and walking them through their recent meals in detail — asking them to dig up grocery receipts, check food delivery apps, and recall everything they consumed in the days before getting sick. The goal is to find a common food item that links the cases together. Cyclosporiasis is caused by the parasite Cyclospora cayetanensis, typically found in contaminated fresh produce, and can cause prolonged diarrhea, fatigue, and stomach cramps. Identifying the source typically requires painstaking case-by-case interviews, since people eat widely varying diets and the incubation period can make recall difficult.

Why it matters

Identifying the contaminated food source is critical to stopping new infections and potentially triggering a recall that could protect people beyond Washtenaw County. Cyclospora outbreaks in the U.S. have previously been traced to nationally distributed produce items, meaning the reach could extend well beyond the local area.

What's next

Investigators are working through the interview data to identify a common food source among the hundreds of cases, which would guide any potential recall or public warning.

Key facts

• The outbreak is in Washtenaw County, Michigan
• Hundreds of people have been reported sick with cyclosporiasis
• Public health nurses were pulled from other assigned duties to work the outbreak
• Investigators are using grocery receipts and food delivery app histories to reconstruct patients' diets
• Cyclospora cayetanensis is a parasite typically linked to contaminated fresh produce

Bias & framing notes

All three sources ran identical reporting — likely the same wire or shared content — so there is no independent corroboration and no variation in framing or detail. The trust score reflects the consistent factual content but is limited by the lack of any independent sourcing.

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